I'm having the same issue. I've defeated him, it says I need to collect a portal stone in the labyrinth but quest tracker doesn't send me anywhere and my map doesn't give any indication of where it might be.

You will need to fully do the instance. If you dont know how it works i will give you the basics.

First you are asked to take out the Silver Sintinel to find a bridge key. you then are told use the key to create a bridge to the larger part of the area, where you fight Devora Shadowcrown, Andor Bristleback, and Zora Steelwielder, Three escaped prisoners that wonder the streets. You then will gain access to the Dean's lair, where Dean Vladimir Darkflame lives. After you help him by collecting some of the items he lost, He will decide to not admit you to the Acadamy and fight you. Once you kill him you should be finished. If not check the quest goal.

Stone Rose Location: Search behind the tower near the gallium Palladin. History of Dragonspyre book: In the Property Master's tower (correct me if his name is wrong.)

I supposely beat the guy in labyrinth the vlad guy and now i dont know where to go next help would be nice

After you beat Vladimir and finish the Labyrinth, the quest arrow should have directed you back to the Crystal Guide in the Necropolis. You might have lost the overall quest series under all the sub tasks required within the Labyrinth. From the Crystal Guide, you are started on the Dragonspyre Academy tasks/quests.

I'm having the same issue. I've defeated him, it says I need to collect a portal stone in the labyrinth but quest tracker doesn't send me anywhere and my map doesn't give any indication of where it might be.

You don't have to go find the portal stone. You automatically get it when you defeat Vladimir. If you defeated him, you should head to the Crystal Guide.